Phase Equilibrium of Ethanol + CO<sub>2</sub> and Acetone + CO<sub>2</sub> at Elevated Pressures

Day, Chany-Yih; Chang, Chieh-Ming J.; Chen, Chiu-Yang

doi:10.1021/je9804890

Cited by 37 publications

(27 citation statements)

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“…These pressures were selected as higher PC enrichment was observed at low pressures using 10 wt% ethanol in SC-CO 2 (10). Ethanol was chosen as the co-solvent because: (i) It is GRAS; (ii) solubility of PC is higher in ethanol than the solubility of other PL in ethanol (13); and (iii) phase behavior of CO 2 /ethanol at high pressures is available (11,14,15).…”

Section: Resultsmentioning

confidence: 99%

Selective extraction of phosphatidylcholine from lecithin by supercritical carbon dioxide/ethanol mixture

Teberikler

Köseoglu

Akgerman

2001

J Americ Oil Chem Soc

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Selective extraction of phosphatidylcholine (PC) from deoiled soybean lecithin using supercritical fluid (SCF) mixtures of carbon dioxide (CO 2 ) and ethanol was studied at moderate pressures. Temperature was varied between 60 and 80°C at pressures of 17.2 and 20.7 MPa. Ethanol was added as co-solvent to supercritical CO 2 at the levels of 10 and 12.5 wt%. Constant rate of extraction of the individual phospholipids (PL) was observed for 150 min during which the extractions were carried out. Pressure and ethanol fraction had a positive effect on the selective extraction of PC, whereas temperature had a negative effect. Under all the conditions studied, the extracts were mainly composed of PC while the extraction of the other PL was very low. Extraction at 60°C and 20.7 MPa with 10 wt% ethanol/90 wt% CO 2 SCF mixture resulted in 95% selectivity to PC.

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Section: Resultsmentioning

confidence: 99%

Selective extraction of phosphatidylcholine from lecithin by supercritical carbon dioxide/ethanol mixture

Teberikler

Köseoglu

Akgerman

2001

J Americ Oil Chem Soc

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“…Day et al have measured both the vapor and liquid phase densities of a CO2 and ethanol mixture at equilibrium [28], and their data was used to evaluate Equation (6). At pressures below 30 bar, the average relative deviation of vapor phase density for σhi = ±1 mm is 116%, but if σhi = ±0.01 mm it is 1.2%.…”

Section: Measurement Equipmentmentioning

confidence: 99%

Rheology and Phase Behavior of Carbon Dioxide and Crude Oil Mixtures

Crawshaw

Trusler

et al. 2016

Energy Fuels

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KEYWORDSRheology, phase behavior, heavy crude oil, carbon dioxide, viscosity, non-Newtonian fluid ABSTRACTThe rheology of Zuata heavy crude oil, saturated with carbon dioxide, was studied at a temperature of 50 °C and pressures up to 220 bar. Observations of phase behavior were also reported and used to interpret the rheological data. The crude oil is very viscous and non-Newtonian at ambient pressure, but when brought into equilibrium with CO2 the non-Newtonian behavior was weakened and eventually disappeared at high CO2 pressures. When diluted with 10 wt% and 30 wt% toluene, the diluted crude oils and their mixtures with CO2 behaved as Newtonian fluids. The CO2 saturated mixture of the crude oil samples showed an exponential decrease in viscosity with increasing CO2 pressure, but an increase in viscosity at higher pressures. Observing through a view cell, the CO2 dissolution caused a swelling effect on the original crude. When saturated with CO2, the swelling effect also occurred on the 10 wt% diluted crude oil, but the volume of the oil rich phase was 2 decreased at higher pressures. However, for the 30 wt% diluted crude oil, a second liquid phase was observed on top of the oil rich phase, at pressures higher than the CO2 critical point. The mixture viscosity was inversely proportional to the CO2 solubility.

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“…1995 at 28ЊC for ethyl acetate and acetonitrile, and from Ž . Day et al 1996 at 30ЊC for acetone. Our calculations show that local and bulk compositions significantly differ from each other.…”

Section: Local Composition Around Phenol Bluementioning

confidence: 99%

Relationship between volume expansion, solvent‐power, and precipitation in GAS processes

et al. 2003

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Phase Equilibrium of Ethanol + CO₂ and Acetone + CO₂ at Elevated Pressures

Cited by 37 publications

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Selective extraction of phosphatidylcholine from lecithin by supercritical carbon dioxide/ethanol mixture

Selective extraction of phosphatidylcholine from lecithin by supercritical carbon dioxide/ethanol mixture

Rheology and Phase Behavior of Carbon Dioxide and Crude Oil Mixtures

Relationship between volume expansion, solvent‐power, and precipitation in GAS processes

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Phase Equilibrium of Ethanol + CO2 and Acetone + CO2 at Elevated Pressures

Cited by 37 publications

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Selective extraction of phosphatidylcholine from lecithin by supercritical carbon dioxide/ethanol mixture

Selective extraction of phosphatidylcholine from lecithin by supercritical carbon dioxide/ethanol mixture

Rheology and Phase Behavior of Carbon Dioxide and Crude Oil Mixtures

Relationship between volume expansion, solvent‐power, and precipitation in GAS processes

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Phase Equilibrium of Ethanol + CO₂ and Acetone + CO₂ at Elevated Pressures